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The displacement of a particle executing simple harmonic motion is given by $y=A_0+A\sin\omega t+B\cos\omega t$. Then the amplitude of its oscillation is given by:
A
$A_0+\sqrt{A^2+B^2}$
B
$\sqrt{A^2+B^2}$
C
$\sqrt{A_0^2+(A+B)^2}$
D
$A+B$